#赋值运算符  =
# += -= *= /= %=  **=
# +=
a=2
a+=2  # 相等于 a=a+2  a=4
a*=3   # a=4*3=12
print(a)
#  12    6     64
b=3
b/=3
b+=4
b**=4
print(b)

a=4  +  5  *  3 > 12
print(a)
# true
a=4  +  5  *  (3 > 12)
print(a)
#  4 9   报错
a= 4  +  5  *   3 == 12
print(a)
#5  错误

